XpdfWidget

The XpdfWidget/Qt™
class provides a PDF viewer widget for the Qt cross-platform GUI
framework. XpdfWidget can be used to add PDF viewing capability to a
Qt app on Windows, Linux, Embedded Linux, and MacOS.

XpdfWidget also serves as the core of XpdfReader. If you'd like to
see a demonstration of XpdfWidget's capabilities, you
can download XpdfReader here.